GREENBELT, Md. - NASA will hold a conference at 10 a.m. PST on May 15 to discuss the strongest evidence to date that dark matter exists. This evidence was found in a ghostly ring of dark matter in the cluster CL0024 17, discovered using NASA's Hubble Space Telescope. The ring is the first cluster to show a dark matter distribution that differs from the distribution of both the galaxies and the hot gas.

The discovery will be featured in the May 15 issue of the Astrophysical Journal.